remove unused function

cmd/sidecar/p2p.go

 package main
 
 import (
-	"crypto"
 	"fmt"
 
 	crypto2 "github.com/libp2p/go-libp2p-core/crypto"
 	"github.com/libp2p/go-libp2p-core/peer"
 	"github.com/link33/sidecar/internal/repo"
 	"github.com/meshplus/bitxhub-kit/crypto/asym"
-	"github.com/meshplus/bitxhub-kit/crypto/asym/ecdsa"
 	"github.com/urfave/cli"
 )
 
@@ -53,17 +51,3 @@ func p2pID(ctx *cli.Context) error {
 	fmt.Println(id)
 	return nil
 }
-
-func convertToLibp2pPrivKey(privateKey crypto.PrivateKey) (crypto2.PrivKey, error) {
-	ecdsaPrivKey, ok := privateKey.(*ecdsa.PrivateKey)
-	if !ok {
-		return nil, fmt.Errorf("convert to libp2p private key: not ecdsa private key")
-	}
-
-	libp2pPrivKey, _, err := crypto2.ECDSAKeyPairFromKey(ecdsaPrivKey.K)
-	if err != nil {
-		return nil, err
-	}
-
-	return libp2pPrivKey, nil
-}